ORCID Profile
0000-0002-5318-3790
Current Organisations
Centre for Quantum Computation and Communication Technology
,
Griffith University
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Quantum Physics | Quantum Optics | Quantum Information, Computation and Communication |
Expanding Knowledge in the Physical Sciences | Communication Networks and Services not elsewhere classified
Publisher: Springer Science and Business Media LLC
Date: 17-07-2012
DOI: 10.1038/NCOMMS1951
Abstract: Quantum communication employs the counter-intuitive features of quantum physics for tasks that are impossible in the classical world. It is crucial for testing the foundations of quantum theory and promises to revolutionize information and communication technologies. However, to execute even the simplest quantum transmission, one must establish, and maintain, a shared reference frame. This introduces a considerable overhead in resources, particularly if the parties are in motion or rotating relative to each other. Here we experimentally show how to circumvent this problem with the transmission of quantum information encoded in rotationally invariant states of single photons. By developing a complete toolbox for the efficient encoding and decoding of quantum information in such photonic qubits, we demonstrate the feasibility of alignment-free quantum key-distribution, and perform proof-of-principle demonstrations of alignment-free entanglement distribution and Bell-inequality violation. The scheme should find applications in fundamental tests of quantum mechanics and satellite-based quantum communication.
Publisher: Informa UK Limited
Date: 05-02-2010
Publisher: The Optical Society
Date: 25-11-2013
DOI: 10.1364/OL.38.005083
Publisher: Springer Science and Business Media LLC
Date: 05-04-2022
DOI: 10.1038/S41467-022-29376-4
Abstract: Long-distance optical quantum channels are necessarily lossy, leading to errors in transmitted quantum information, entanglement degradation and, ultimately, poor protocol performance. Quantum states carrying information in the channel can be probabilistically lified to compensate for loss, but are destroyed when lification fails. Quantum correction of the channel itself is therefore required, but break-even performance—where arbitrary states can be better transmitted through a corrected channel than an uncorrected one—has so far remained out of reach. Here we perform distillation by heralded lification to improve a noisy entanglement channel. We subsequently employ entanglement swapping to demonstrate that arbitrary quantum information transmission is unconditionally improved—i.e., without relying on postselection or post-processing of data—compared to the uncorrected channel. In this way, it represents realization of a genuine quantum relay. Our channel correction for single-mode quantum states will find use in quantum repeater, communication and metrology applications.
Publisher: The Optical Society
Date: 10-02-2015
Publisher: Springer Science and Business Media LLC
Date: 21-05-2023
DOI: 10.1038/S41598-023-35280-8
Abstract: Nonlocality, probably the principal friction between Quantum Physics and Relativity, disturbed the physicists even more than realism since it looks to originate superluminal signalling, the Einsteinian “Spooky action at a distance”. From 2000 on, several tests to set lower bounds of the Spooky action at a distance velocity ( $$c \\beta _{t,max}$$ c β t , m a x ) have been performed. They are usually based on a Bell Test performed in km long and carefully balanced experimental setups to fix a more and more improved bound making some assumptions dictated by the experimental conditions. By exploiting advances in quantum technologies, we performed a Bell’s test with an improved bound in a tabletop experiment of the order of few minutes, thus being able to control parameters otherwise uncontrollable in an extended setup or in long lasting experiments.
Publisher: Elsevier BV
Date: 11-2022
Publisher: American Physical Society (APS)
Date: 07-09-2018
Publisher: Springer Science and Business Media LLC
Date: 18-09-2013
DOI: 10.1038/NCOMMS3432
Publisher: American Physical Society (APS)
Date: 08-08-2014
Publisher: IOP Publishing
Date: 15-01-2013
Publisher: The Optical Society
Date: 10-05-2016
DOI: 10.1364/OE.24.010869
Publisher: The Optical Society
Date: 10-12-2010
DOI: 10.1364/OE.18.027205
Publisher: American Physical Society (APS)
Date: 21-08-2009
Publisher: The Optical Society
Date: 12-01-2012
DOI: 10.1364/OL.37.000172
Publisher: American Physical Society (APS)
Date: 07-05-2010
Publisher: Springer Science and Business Media LLC
Date: 12-02-2015
DOI: 10.1038/SREP08424
Publisher: American Physical Society (APS)
Date: 07-11-2022
Publisher: The Optical Society
Date: 05-03-2012
DOI: 10.1364/AO.51.0000C1
Publisher: Springer Science and Business Media LLC
Date: 02-11-2018
DOI: 10.1038/S41467-018-06601-7
Abstract: The use of quantum resources can provide measurement precision beyond the shot-noise limit (SNL). The task of ab initio optical phase measurement—the estimation of a completely unknown phase—has been experimentally demonstrated with precision beyond the SNL, and even scaling like the ultimate bound, the Heisenberg limit (HL), but with an overhead factor. However, existing approaches have not been able—even in principle—to achieve the best possible precision, saturating the HL exactly. Here we demonstrate a scheme to achieve true HL phase measurement, using a combination of three techniques: entanglement, multiple s lings of the phase shift, and adaptive measurement. Our experimental demonstration of the scheme uses two photonic qubits, one double passed, so that, for a successful coincidence detection, the number of photon-passes is N = 3. We achieve a precision that is within 4% of the HL. This scheme can be extended to higher N and other physical systems.
Publisher: Informa UK Limited
Date: 17-08-2012
Publisher: AIP Publishing
Date: 04-07-2011
DOI: 10.1063/1.3610474
Abstract: S les of Ag+/Na+ ion-exchanged glass that have been subject to intense laser irradiation may develop novel optical properties, as a consequence of the formation of patterns of silver nanoparticles and other structures. Here, we report the observation of a laser-induced permanent transverse birefringence, with the optical axis forming a radial pattern, as revealed by the spin-to-orbital angular momentum conversion occurring in a probe light beam. The birefringence pattern can be modeled well as resulting from thermally-induced stresses arising in the silver-doped glass during laser exposure, although the actual mechanism leading to the permanent anisotropy is probably more complex.
Publisher: American Physical Society (APS)
Date: 20-01-2017
Publisher: The Optical Society
Date: 27-12-2010
Publisher: Springer Science and Business Media LLC
Date: 19-10-2015
DOI: 10.1038/NCOMMS9606
Abstract: The standard method for experimentally determining the probability distribution of an observable in quantum mechanics is the measurement of the observable spectrum. However, for infinite-dimensional degrees of freedom, this approach would require ideally infinite or, more realistically, a very large number of measurements. Here we consider an alternative method which can yield the mean and variance of an observable of an infinite-dimensional system by measuring only a two-dimensional pointer weakly coupled with the system. In our demonstrative implementation, we determine both the mean and the variance of the orbital angular momentum of a light beam without acquiring the entire spectrum, but measuring the Stokes parameters of the optical polarization (acting as pointer), after the beam has suffered a suitable spin–orbit weak interaction. This ex le can provide a paradigm for a new class of useful weak quantum measurements.
Publisher: Springer Science and Business Media LLC
Date: 02-03-2022
DOI: 10.1038/S41534-022-00531-5
Abstract: Violating a nonlocality inequality enables the most powerful remote quantum information tasks and fundamental tests of quantum physics. Loophole-free photonic verification of nonlocality has been achieved with polarization-entangled photon pairs, but not with states entangled in other degrees of freedom. Here we demonstrate completion of the quantum steering nonlocality task, with the detection loophole closed, when entanglement is distributed by transmitting a photon in an optical vector vortex state, formed by optical orbital angular momentum (OAM) and polarization. As well as opening up a high-efficiency encoding beyond polarization, the critically important demonstration of vector vortex steering opens the door to new free-space and satellite-based secure quantum communication devices and device-independent protocols.
Publisher: The Optical Society
Date: 16-02-2011
DOI: 10.1364/OE.19.004085
Publisher: Springer Science and Business Media LLC
Date: 09-10-2017
Publisher: AIP Publishing
Date: 13-12-2010
DOI: 10.1063/1.3527083
Abstract: Exploiting electro-optic effects in liquid crystals, we achieved real-time control of the retardation of liquid-crystal-based q-plates through an externally applied voltage. Electro-optic q-plates can be operated as electrically driven converters of photon spin into orbital angular momentum, enabling a variation of the orbital angular momentum probabilities of the output photons over a time scale of milliseconds.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 06-03-2015
Abstract: A discrete quantum walk occurs in the orbital angular momentum space of light, both for a single photon and for two simultaneous photons.
Publisher: IOP Publishing
Date: 27-04-2011
Publisher: AIP Publishing
Date: 14-10-2019
DOI: 10.1063/1.5115814
Abstract: Photons have been a flagship system for studying quantum mechanics, advancing quantum information science, and developing quantum technologies. Quantum entanglement, teleportation, quantum key distribution, and early quantum computing demonstrations were pioneered in this technology because photons represent a naturally mobile and low-noise system with quantum-limited detection readily available. The quantum states of in idual photons can be manipulated with very high precision using interferometry, an experimental staple that has been under continuous development since the 19th century. The complexity of photonic quantum computing devices and protocol realizations has raced ahead as both underlying technologies and theoretical schemes have continued to develop. Today, photonic quantum computing represents an exciting path to medium- and large-scale processing. It promises to put aside its reputation for requiring excessive resource overheads due to inefficient two-qubit gates. Instead, the ability to generate large numbers of photons—and the development of integrated platforms, improved sources and detectors, novel noise-tolerant theoretical approaches, and more—have solidified it as a leading contender for both quantum information processing and quantum networking. Our concise review provides a flyover of some key aspects of the field, with a focus on experiment. Apart from being a short and accessible introduction, its many references to in-depth articles and longer specialist reviews serve as a launching point for deeper study of the field.
Publisher: American Physical Society (APS)
Date: 13-08-2010
Publisher: Springer Science and Business Media LLC
Date: 19-01-2015
DOI: 10.1038/SREP07840
Publisher: Springer Science and Business Media LLC
Date: 08-2016
Publisher: The Optical Society
Date: 12-03-2013
DOI: 10.1364/OL.38.000887
Publisher: American Physical Society (APS)
Date: 26-08-2010
Publisher: American Association for the Advancement of Science (AAAS)
Date: 05-01-2018
Abstract: Entanglement swapping enables verified nonlocal correlations over a high-loss channel with the detection loophole closed.
Publisher: AIP Publishing
Date: 20-07-2017
Location: Australia
Start Date: 02-2021
End Date: 02-2024
Amount: $600,000.00
Funder: Australian Research Council
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